Real Dictionary

crown
countable noun: A crown is a circular ornament, usually made of gold and jewels, which a king or queen wears on their head at official ceremonies. You can also use crown to refer to anything circular that is worn on someone's head.

crown in American English
a garland or wreath worn on the head as a sign of honor, victory, etc.
intransitive verb: to reach a stage in delivery where the largest diameter of the fetal head is emerging from the pelvic outlet
noun: any of various types of headgear worn by a monarch as a symbol of sovereignty, often made of precious metal and ornamented with valuable gems
transitive verb: to invest with a regal crown, or with regal dignity and power

crown in British English
noun: an ornamental headdress denoting sovereignty, usually made of gold embedded with precious stones
noun: the sovereignty or realm of a monarch